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Advice for replacing bearings, brushes

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Forum topic by ChesapeakeBob posted 08-02-2011 01:14 AM 3700 views 0 times favorited 10 replies Add to Favorites Watch
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ChesapeakeBob

365 posts in 3238 days


08-02-2011 01:14 AM

Topic tags/keywords: bearings brushes repair

I have one old Makita #2708 tablesaw and another old Black & Decker router and both need bearings, brushes. Can anyone either instruct me on the process to replace the bearings or direct me to an instruction manual OR a website that will direct me through the process.

Thanks!

-- Chesapeake Bob, Southern Maryland


10 replies so far

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ChesapeakeBob

365 posts in 3238 days


#1 posted 08-02-2011 07:04 PM

I know there must some expert advice available on this subject!

-- Chesapeake Bob, Southern Maryland

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Hermando

75 posts in 2553 days


#2 posted 08-03-2011 05:07 PM

Hello Bob. Its nice to see someone that knows the value of the older Makita 2708. I was given my first table saw makita 2708 by a very good friend who has been an inspiration into wood working. When I received the saw it was in need of some repairs. If I could not get it fixed there would be no hard feelings for putting it to rest. I took the saw to the Authorized Makita service center here in Denver. I had the bearings, brushes and power cord replaced along with a bench test of the motor. It cost me about $100. Well worth it. I have it in the Makita brand Rousseau table and is quite accurate for cuts.

I also bought a used makita 2703 from Craiglist for $40 and had it factory serviced (It was in sad shape, but for $40 what did I have to lose if it could not be serviced) thank goodness its a Makita. I also put this one in a drop in Skil table and built a rolling bench. Ended up selling it and kept the 2708. I am now looking to buy another 2708 from Craiglist, even if it needs service. These saws are one of the best benchtops ever built. I want it as a back up for my drop in table since the 2708 is the only one that fits. I often considered buying a new table saw, but still enjoy the Makita 2708.

I have the manual and parts list for the 2708 and many other table saws that I have downloaded. If you want to attempt a repair on your own. I talked with Makita (great tech support) the other day and from what I was told they still have all parts for these older 2708 saws. You can also find the nearest factory service center through the Makita web site. They will give free estimates, only drawback is if they disassemble your saw and you decide to not have service performed, you just get the parts back and have to assemble it yourself. I have invested about $100 for each of my saws and its been well worth it to have a totally factory rebuilt makita 2708 table saw.

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kredfish00

6 posts in 300 days


#3 posted 11-28-2016 03:30 AM

Does anyone have advice on pulling the rear bearing on a Makita 2708? I cannot seem to find a bearing puller small enough to do the job. Any advice?

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MrUnix

5718 posts in 1954 days


#4 posted 11-28-2016 03:38 AM

Ignoring the fact that this thread was from 5 years ago :)

Which bearing? Post a picture so we know what you are talking about. And there are a lot of different ways to yank a bearing… with a puller, a bearing splitter, bench vice, ball joint pickle fork, cutting with a hack saw, etc… haven’t met a bearing yet that I haven’t been able to remove.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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kredfish00

6 posts in 300 days


#5 posted 11-28-2016 03:52 AM

Here you go Brad! as you can see I cannot get under it…...there must be a way to break it loose!

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MrUnix

5718 posts in 1954 days


#6 posted 11-28-2016 04:15 AM

I’m guessing that is the motor housing? From the parts diagram, the bearing housing (#87) should be separate from the rest of the housing (#4), but it doesn’t appear to be like that in your photo, or maybe it’s just a cover despite what it’s called in the parts list (it’s called a housing and sold “without the bearing”).

Anyway, that one looks like it should be pretty simple… find a way to support the housing with the bearing end facing upwards, and with enough clearance for the motor armature to hang free. If you have a large enough vice, you can open it up to the proper size and rest it on the jaws of the vice. Then using a wooden dowel or something similar, tap on the end of the shaft with a soft blow hammer, wooden mallet or small hammer to force the shaft down out of the bearing. Don’t go gorilla on it or you might damage the housing, and make sure you have something under it to catch the armature when it pops free. Once out of the way, the bearing should be easy to remove from the other side with a drift punch or similar.

Another method would be to use the threaded holes for the screws (#86) to secure a puller, with the center shaft pushing on the center of the armature shaft in the little dimple. However, if that housing is plastic, it might not provide sufficient holding power for the puller.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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kredfish00

6 posts in 300 days


#7 posted 11-28-2016 04:50 AM

I hear you! Yes the bearing seems to be on the outside of the plastic housing. But it does not look that way in the diagram. It could be from heat build-up when the bearing deteriorated but it seems to be seized on the armature shaft!

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kredfish00

6 posts in 300 days


#8 posted 11-28-2016 07:05 AM

Update…..I was finally able to get the entire armature out of the housing with both bearings still on each end. The trouble was there was an insulation washer part no. 681623-9 that had melted? and adhered itself to the housing! I think. Using two blocks of wood I positioned the housing with the rear end up and tapped on the spindle with a punch thinking I would dislodge the bearing but what it did was push the armature out of the housing when it finally broke the bond of that melted insulation washer. The bearings will have to be pulled with a separator and the new ones pressed back on but I am well on my way.

Thanks so much for the advice!

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bigblockyeti

4471 posts in 1476 days


#9 posted 11-28-2016 11:17 AM

That’s pretty typical, most bearings mounted on the armature shaft of a universal motor are going to be pressed on. Yours came apart the same way over 99% of saw motors (as well as many other small power tools) do. I’ve seen my fair share of something melting inside and not allowing the armature to slide out of the housing the way it’s supposed to. Glad it all worked out for you.

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kredfish00

6 posts in 300 days


#10 posted 11-28-2016 01:08 PM

Here are two pictures of the armature after I freed it up. It looks in great shape. The insulation washer totally fried when the rear bearing went out and that is what had it stuck in the motor housing.

I wonder if someone could indulge me. I have heard of replacing some other parts on this table saw for functional improvement. One article talked about replacing the knob 271254-8 on the level adjustment with a wheel for easy raising and lowering of the blade. And another talked about replacing the thrust washer? with a brass/teflon set? Would anyone know what part they are actually speaking of? ”When you tear it apart to clean off the height adjusting screw, replace the steel thrust washer with a brass one or try and fit a brass/teflon set in there. It will be like new.”_ I am thinking they are referring to the feed nut 321741-8 but I cannot find anything on the schematic referred to as a thrust washer.

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